The correct answer is D. Not to move.
According to the Indian Railway Board’s General Instructions for the Safety of Running of Trains, Rule 144, “In case of water above 100 mm from rail level, the train shall not be moved.” This is because water can cause the train to derail, and it is not safe to move the train in these conditions.
Option A is incorrect because it is the speed of a diesel train in case of water above 50 mm from rail level. Option B is incorrect because it is the speed of a diesel train in case of water above 75 mm from rail level. Option C is incorrect because it is the speed of a diesel train in case of water above 90 mm from rail level.